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View Compilation Error

0_0_25803628_28446.cpp: In function 'void dfs2(int, int)':
0_0_25803628_28446.cpp:28:2: error: reference to 'rank' is ambiguous
  rank[dfn]=x;
  ^
0_0_25803628_28446.cpp:8:133: note: candidates are: int rank [100001]
 int n,m,i,x,y,ma[200001][3],first[100001],a[100001],tot,dfn,dep[100001],size[100001],fa[100001],son[100001],top[100001],tid[100001],rank[100001],aa,bb;
                                                                                                                                     ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/move.h:57:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_pair.h:59,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/utility:70,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:60,
                 from 0_0_25803628_28446.cpp:3:
GCC4.9.2/x86_64-w64-mingw32/include/c++/type_traits:1340:12: note:                 template<class> struct std::rank
     struct rank
            ^
0_0_25803628_28446.cpp: In function 'void build(int, int, int)':
0_0_25803628_28446.cpp:37:43: error: reference to 'rank' is ambiguous
   tree[x].max_=tree[x].min_=tree[x].sum=a[rank[l]];
                                           ^
0_0_25803628_28446.cpp:8:133: note: candidates are: int rank [100001]
 int n,m,i,x,y,ma[200001][3],first[100001],a[100001],tot,dfn,dep[100001],size[100001],fa[100001],son[100001],top[100001],tid[100001],rank[100001],aa,bb;
                                                                                                                                     ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/move.h:57:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_pair.h:59,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/utility:70,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:60,
                 from 0_0_25803628_28446.cpp:3:
GCC4.9.2/x86_64-w64-mingw32/include/c++/type_traits:1340:12: note:                 template<class> struct std::rank
     struct rank
            ^
0_0_25803628_28446.cpp: In function 'int main()':
0_0_25803628_28446.cpp:85:10: error: reference to 'rank' is ambiguous
   memset(rank,0,sizeof(rank));
          ^
0_0_25803628_28446.cpp:8:133: note: candidates are: int rank [100001]
 int n,m,i,x,y,ma[200001][3],first[100001],a[100001],tot,dfn,dep[100001],size[100001],fa[100001],son[100001],top[100001],tid[100001],rank[100001],aa,bb;
                                                                                                                                     ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/move.h:57:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_pair.h:59,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/utility:70,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:60,
                 from 0_0_25803628_28446.cpp:3:
GCC4.9.2/x86_64-w64-mingw32/include/c++/type_traits:1340:12: note:                 template<class> struct std::rank
     struct rank
            ^
0_0_25803628_28446.cpp:85:24: error: reference to 'rank' is ambiguous
   memset(rank,0,sizeof(rank));
                        ^
0_0_25803628_28446.cpp:8:133: note: candidates are: int rank [100001]
 int n,m,i,x,y,ma[200001][3],first[100001],a[100001],tot,dfn,dep[100001],size[100001],fa[100001],son[100001],top[100001],tid[100001],rank[100001],aa,bb;
                                                                                                                                     ^
In file included from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/move.h:57:0,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/bits/stl_pair.h:59,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/utility:70,
                 from GCC4.9.2/x86_64-w64-mingw32/include/c++/algorithm:60,
                 from 0_0_25803628_28446.cpp:3:
GCC4.9.2/x86_64-w64-mingw32/include/c++/type_traits:1340:12: note:                 template<class> struct std::rank
     struct rank
            ^


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